https://bugs.kde.org/show_bug.cgi?id=357547

            Bug ID: 357547
           Summary: Can't render webm
           Product: kdenlive
           Version: unspecified
          Platform: Compiled Sources
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: Video Display & Export
          Assignee: j...@kdenlive.org
          Reporter: qubo...@gmail.com

Created attachment 96459
  --> https://bugs.kde.org/attachment.cgi?id=96459&action=edit
faulty webm render

Videos rendered to webm won't play back video in mplayer, vlc, ffplay. melt
plays them back incorrectly.

Steps to reproduce:
1. Start kdenlive
2. Add color clip
3. Move color clip to timeline
4. Render
Destination: Web sites
Profile: WebM
All other: default value
5. View render result in
a) vlc
b) mplayer
c) ffplay
d) melt

Expected result:
a-d). Proper video playback

Actual result:
a,b) no video
c) no video, ffplay doesn't stop playin back when it reaches end
d) huge white video.
[matroska,webm @ 0x2743c20] Invalid EBML number size tag 0x01 at pos 3806
(0xede)
[matroska,webm @ 0x275ca60] Invalid EBML number size tag 0x01 at pos 3806
(0xede)
Not sure why it says matroska.webm I guess it might be using mks format instead
of webm for some reason?

Attached is one webm output.

Note: when added before rendering, audio appears to be played back correctly in
mplayer (others not tested).

This issue has been mentioned on the forums recently:
https://forum.kde.org/viewtopic.php?f=265&t=130342#p348692

This might be related to https://bugs.kde.org/show_bug.cgi?id=348147

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